Asbestos-cement mold for steam-pipe fittings.



S. G. DOBHRING.

ASBESTOS CEMENT MOLD r01: STEAM PIPE FITTINGS. APPLICATION YILED AUG 23, 1913.

1,1 1 6,394. Patented Nov. 10, 1914.

Z attorneys,

STEPHEN. C. DOEI'IRING, OF CHICAGO, ILLINOIS.

ASBESTOS-CEMENT MOLD FOR STEAM-PIPE FITTING-S.

Specification of Letters Patent.

Application filed August 23, 1913. Serial No. 786,296.

To all whom it may concern:

Be it known that I, STEPHEN C. DOEHR- me, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Asbestos-Cement Molds for Steam-Pipe Fittings; and I do hereby declare the following to be a full,

clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to removable molds to be used in the formation of heat resisting coatings for steam pipes and the like, and an object of the invention is to provide complementary sections having the general formation of the coating to be applied to the surface needing protection, said molds be ing removable after the asbestos or other plastic has set.

A further object of the invention is to provide a mold of such formation as will enable an operator to apply the plastic material to a limited portion of a pipe system.

With these and other objects in View the invention comprises certain novel constructions, combinations and arrangements of parts as will be hereinafter more fully described and claimed.

In the accompanying drawing, where I have illustrated several of the many possible forms of my mold: Figure l is a perspective view of the mold to be used upon an elbow. Fig. 2 is a top plan view of the form to be used on a four-way connection. Fig. 3 shows a form for a T-connection. Fig. 4 shows a side elevation of the form as applied to a valve. Fig. 5 shows a vertical section through the end of an assembled mold showing means for connecting said mold sections together.

Like reference characters designate corresponding parts.

I am aware that the present practice in steam fitting and allied arts employs sectional heat insulators of asbestos or other suitable plastic materials which are purchased already molded in halves or other desirable sections and are then placed upon the work to be insulated, and bands or other suitable means provided for holding the several sections in place. For the same surface area to be insulated I have found it very much cheaper to buy bulk asbestos or such material and form the coating upon the pipe from the material when the same is in a plastic condition.

In the drawings, the form shown in Fig. l is that which may be used for elbows and isshown as comprising two sections 1 and 2, which are similar but complementary in outline and are provided respectively with end plates 3 and l which form flanges, the inner edges of which are notched to fit closely around the work to be insulated, this work being illustrated as a pipe 5. As shown in Fig. 2, the mold may be made in two sections for a four-way connection, the same being provided with end plates or flanges whose planes are practically perpendicular to the pipe. Fig. 3 shows the form for a T-connection substantially similar to that shown in Fig. 2,.while Fig. 4 shows a form of mold which may be used in connection with a valve.

As shown in Figs. 1 and 5, I have provided means for holding the sections together after the same have been applied to pipe 5, the particular securing means shown being formed of a snap spring 6 secured to one of the sections, such as 2 in Fig. 1, the free end of the spring having a latch 7 engaging a locking member or hook 8 secured to the other section of said mold, such as 1 in Fig. 1. These locking means may be provided in pairs upon each of the end plates of the mold, and I wish it understood that other forms of locking means may be used than the particular form shown.

lVhen it is desired to use the mold as disclosed, the plastic material which has been previously mixed to a proper consistency may be placed within the sections of the mold until said sections are partly filled, after which they may be fitted around the joint to be coated and the locking means suitably engaged for holding the sections of the mold in place. The ends 3 and 4 serve to keep the material within the mold and at the same time give a finished appearance and a regular edge to the coatingwhen the mold is removed. After the plastic material is set the latches may be undone and the parts of the mold removed, after which an integral insulating coat may be had, which gives a pleasing appearance and it is held to the pipe without the need of auxiliary fastening means, such as straps, used at present. I have found that it is possible to use the mold without providing fastening means, such as a latch 7 and locking mem Patented Nov. 10, 1914.

ber 8, but under certain conditions it is desirable to have these locking means. The

sections may be made of sheet metal of any desired thickness and of such material as Will Withstand the chemical actions incident upon the setting of the insulating material.

What I claim is:

The herein described mold for forming insulating coatings upon steam pipes and the like, the same comprising a pair of complemental-y sections having the general configuration of the object to be coated, end plates carried by the extremities of said sections and projecting inward therefrom and notched to engage the object to be coated,

the extremities of the plates adapted to come into contact With each other When the mold is in position, a pair of hooks carried by one end plate, and a pair of snap springs carried by the other end plate and having latches at their free ends adapted to engage said hooks When the plates are in position, the Whole for use substantially as described.

In testimony whereof I afliX my signature in presence of two Witnesses.

, STEPHEN C. DOEHRING.

Vitnesses FLORA Hnnonn, JAMES M. CAMPBELL.

Copies of this patent may be obtained *or five cents each, by ad ressing the Commissioner of Patents,

Washington, D. C. 

